sound wave velocity of ultrasonic transducer

The two points of the principal stress and its direction can be calculated by the sound wave velocity at the point and the sound velocity of two transverse waves are perpendicular to each other at this point. Different depth measurement ultrasonic transducers were used in the previous measurement. The sound wave velocity and the two polarization directions of 500KHz ultrasonic transducer were measured. When the sound wave velocity is perpendicular to each other, it is necessary to replace and move the transducer by multiple times. Since each fixed transducer cannot be completely at the same point, there are errors in the measurement ,1Mhz ultrasonic transducermay occur, and it is impossible to completely match the binding layer at each fixing. , This will also bring errors to the measurement. 

With this probe, the measurement of the principal stress direction in the solid can be performed by using two perpendicular wave-swect-wave that wafers for each measurement. In the stress measurement of two perpendicular shear waves in a solid, the relationship between the stress in the solid and the ultrasonic sound velocity of high frequency ultrasonic transducer is as follows: where is the sound velocity of the longitudinal wave when the stress is present, and the sound velocity of the two mutually perpendicular transverse waves under the stress, it is the longitudinal and transverse wave velocity of sound when no stress is present. , There are two principal stresses. When the probe is fabricated, the two SMWs of ultrasonic depth sensors are oriented perpendicular to each other. In this way, in the stress measurement, as long as the probe is rotated continuously, The difference in the sound velocity of the transverse wave in the two mutually perpendicular directions is the maximum. 

At this time, the vibration directions of the two transverse wave plates are the two principal stress directions of the testing sample. The two vibration directions of the two transverse wave plates perpendicular to each other are orthogonal to each other. The two principal stress directions coincide and fix the transducer,underwater sound transducer is measuring the sound wave velocity of a longitudinal wave and the sound velocity of two shear waves, then use the formula to calculate the stress at the point. it is the structure of the composite ultrasonic transducer, two transverse wave crystals whose polarization directions are perpendicular to each other,there are two different longitudinal wave chips.